Evaporating apparatus.



No. 685,823. Platented Nov. 5, mm. r. cn-wm.

EVAPORATING APPARATUS.

(Application filed Jung 17, 1901.; (No Model.) 3 Sheets-Shoat l.

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No. 685,823. Patented Nov. 5, IBM.

r. cowm. EVAPDRATING APPARATUS.

(Application filed June 17, 1901.)

(No Ilodel.) 3 Sheets-Sheet 2.

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Patented Nov. 5, I90i.

F. COWIN.

EVAPORATING APPARATUS.

(Application filed June 17, 1901.)

3 Sheets-Sheet 3.

(No Model.)

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UNITED STATES PATENT OFFICE.

FREDERICK OOWIN, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE ANGLO- AMERICANPROVISION COMPANY, OF OIII AGO, ILLINOIS, A CORPO-' RATION OF ILLINOIS.

EVAPORATING APPARATUS.

SPECIFICATION forming part of Letters Patent N 0. 685,823, datedNovember 5, 1901. Application filed .l'une 17, 1901. Serial No. 64,773.(No model.)

To ctZZ whom it may conccrn' Be it known that I, FREDERICK COWIN, acitizen of the United States of America, and

a resident of Chicago, in the county of Cookand State of Illinois, haveinvented certain new and useful Improvements in Evaporating Apparatus,of which the following is a specification.

The main objectof my invention is to provide an improved device foreconomically concentrating and "solidifying a liquid by a continuousprocess of evaporation and drying, in which the same heat is utilizedfor evaporating or concentrating a liquid within a receptacle and dryingthe concentrated liquid upon the outer surface of the receptacle. Iaccomplish these objects bythe device shown in the accompanyingdrawings, in which- Figure 1 is a top plan View of a machine constructedaccording to my invention, showing the general arrangement of itselements and the system of piping. Fig. 2 is a vertical longitudinalsection along the line 2 2 of Fig. 1. Fig. 3 is a transverse verticalsection along the line 3 3. Fig. at is an end elevation,'partly brokenaway, showing means of adjustment of the scrapers. I In the form shownmy device is constructed as follows: A hollow cylinder 6 is mounted onthe hollow sleeves 7 and 8 and journaled in the frames 9 and 10, so asto be revoluble with said sleeves about a horizontal axis. Journaledcentrally in the sleeves 7 and 8 are the shafts 11 and 12. These shaftsare secured against rotation by the straps 13 and 14, which areconnected to bed-plates 15 on the floor. Each of the shafts 11 and 12has extending longitudinally through same three apertures, through whichpipes lead to the interior of the cylinder. One of these pipes 16,leading through the shaft 11, terminates in the header or manifold 17. Asecond header 18 is connected with the header 17 by a series ofheating-coils 19 and has leading from it a pipe 20, which passes throughthe shaft 12. A pipe 21, leading from the liquid-supply pump 22, passingthrough one of the apertures in the shaft 12, and extending into thecylinder 6 above the coils, serves to supply the cylinder with theliquid that is to be dried. The part 23 of the pipe 21 has a 'teriorpiping.

series of openings in its sides, so that the incoming liquid will beequally distributed throughout the length of the cylinder. pipe 24 leadsupwardly from near the bottom of the cylinder, passes through the shaft11, and connects with the pump 25. An airpump 27 is connected by meansof the pipe 28 with the upper part of the interior of the cylinder. Thepipe 29, terminating in the aircock 30, connects the upper part of theinterior of the cylinder with the outer air for the purpose of admittingair to the cylinder. A manhole 31 is located in one end of the cylinderto permit of access to the interior for the purpose of erection andrepair of the in- The cylinder may be drained for cleaning purposes byremoving the plug 32. Four gage-glasses 33 are arranged on one end ofthe cylinder to indicate the level of the liquid within. The jointsbetween the sleeves 7 and 8 and the shafts 11 and 12 are made air-tightby means of the stuffing-boxes 34. A tank 35 is disposed horizontallybelow the cylinder 6 and adapted to contain a liquid in contact with theouter periphery of the cylinder 6. This tank is connectedwith the pump25 by means of the pipe 26, so that the liquid may be drawn from theinterior of the cylinder 6 and discharged into the tank 35. The outersurface of the tank is surrounded by a steam-jacket 36, which receivesthrough the pipe 20 the exhaust-steamfrom the coils 19 and which in turnexhausts throughthe piping 37. The cylinder is caused to revolve on itsjournals by means of the gear 38, which is driven by a pinion on thecounter-shaft 39, this counter-shaft receiving The its power from a beltrunning on the tight and loose pulleys 4.0. A knife or blade 41, securedto the shaft 42, extends longitudinally above the tank and along oneside of the cylinder and is adapted to regulate the thickness of thedeposit of liquid taken up by the outer surface of the cylinder as itrevolves.

in contact with the liquid in the tank. This knife is arranged to beregulated transversely of said cylinder by means of the adj ustingscrewsA3 and 44. The distance of the edge of the knife from the surface of thecylinder is also regulated by rotating the knife and its shaft 42 bymeans of the wheel 15 and 1' transverse slots in said frames. 7

The operation of my device is as follows:;

V The liquid that is to beevaporated and dried the coils 19.

is forced through the pipe 21 and into the cylinder 6 by the pump 22,the cylinder beingv filled to a level somewhat above the top of volve bypower, applied to. the gear 88.

positions remain in the relative positions shown in Fig. 2. Steamisadmitted to the .coils from'the pipe 16 and the liquid is heated. The,air andflvapors above the liquid are exhausted by means of the.air-pump-27, Ithus .-red ucing the pressure on the liquid and caus-.

ing same to evaporate rapidly andjbecoine concentrated. If-at any timeit is desirable to break the vacuum, this can be done by admitting theair through the air-cock 30. i The concentrated liquid is withdrawn fromthe 'lovverpart of the cylinder by the pump 25. and is discharged intothe. tank 35, where it receives additionalheat through the walls of thetank-and is further concentrated. The

liquid in the tank 35 is maintained at, sucha.

' level asto be in contact with the surface of "means of which itisfrem'oved from the surface and guide'd beyond the side of the tank,

intoa receptacle placed forv that-purpose. It

'and that the heat-su pplyis' very economically" the cylinder 6. Acoating'or deposit isformed on the cylinder 6. Thethickness ofthis-coats ingis regulated by mea'ns of the blade 41. The coatingreceiveslfu'rther heat fromflthe walls of the cylinder,thesp'eedof-revolution of thecy-linder being regulated so that thedeposit on the surface of, the cylinder is dried bythe'time itreachesthe" scraper 47, by

'where itLis allowed to. fall upon the .fiooror.

will be seen that the 'process'is continuous used, serving bothforconcentrating the liqtails except as hereinafter limited in the.

'uidand for heating the drying-surface.

of the device shown may be altered without; departing from. the spiritof myinvention. .I therefore do not confine myself to suchdee claims.

What'I claim as myin'vention, and desire 1 tosecure by Letters Patent,is-

1. In an evaporator and drier, the combination of a receptacleadapted/co contain a liquid, a heater in said receptaclameansfor drawingthe liquid from said receptacle and means for supplying a film of saidliquid on the outer surface of the receptacle, and a This scraper e7 isThe cylinder is caused to re The coils and interior piping being fixedintheir scraper acting on said outer-surface for removing said film.

2.-In'-an evaporator and drier, the combination of a movable receptacleadapted to contain a liquid, a heater in said receptacle,

.means for drawing theliquid from said receptacle and means forsupplying a film of said liquid on the outer. surface'ofthe'receptacle,and a scraper acting on said outer surface forremoving the film.

3. In an evaporator and drier, the combination ofa' revoluble receptacleadapted to containa liquid, a heater in said receptacle, means fordrawing the {liquid from said receptacle and means-for supplying afilmof said liquid on the outer, surface of the receptacle, and ascraper acting on said outer surface for removing the film. 1

'4, In an evaporator and drier, the combination of a revoluble'cylinderadapted tocontain a liquid, a heater insaid cylinder,-'means forvdrawing the. liquid from said receptacle and means forv supplying a filmof:said liquid on, the outer surface of the cylinder,and a scraperacting on said moving the film.

v5. In an. evaporator and drier,.the combi nation of a revolublecylinder adapted to con tain aliquid, a heater in said cylinder, meansfor drawing the liquid from said receptacle and means for supplying afilm of said liquid on the periphery of the cylinder, anda scraperacting on said periphery for removing the film. 1 6. In an evaporatorand, drier, the combination of a cylinder revoluble on: ahorizontally-disposed axis and adaptedto contain a liquid, a'heater'insaid cylinder, a tank under said cylinder arranged to contain'a liquidin contact with the lower part of the peripheryof the cylinder, andmeans for drawing, the liquid from said cylinderand discharging sameintosaidtank. t

" 7; In an evaporator and. drier, the combination. of acylinderrevoluble on a horizontally-disposed axis'and 'adapted'tocontain a liquid, a'heater in said cylinder, a tank under said cylinderarranged to contain a liquid fincontact with the lower part of theperiphcry of the cylinder, means forjdrawing the liquid from saidcylinder and discharging same into said tank, and a scraper acting on ip I I the periphery of said cylinder. It will be understood thatnumerous details ;.nationof a receptacle adaptedto contain a liquid andhaving a. supply-port and a dischargeport,a heater in said receptacle,means connected with said discharge-port for withoutersurfacefor revdrawing liquid from said receptacle and means for supplying a film ofsaid liquid upon the outer surface of the receptacle, a scraper actingon said outer surface, and a vacuumpump connected with the upperpart ofthe receptacle for exhausting the air or vapor therefrom.

10. In an evaporator and drier, the combination of a cylinder revolubleon a horizontally-disposed shaft and adapted to contain a liquid,saidshaft having apertures through same leading into the interior of thecylinder,

a steam-conduit Within the cylinder and having supply and exhaustconnections through the apertures in said shaft-,- a liquid-supplyconduit and a liquid-discharge conduit communicating with the interiorof the cylinder through apertures in said shaft, and means connectedWith said liquid-discharge conduit for spreading the liquid upon theouter surface of the cylinder.

11. In an evaporator and drier, the combination of a cylinder revolubleon a horizontally-disposed shaft and adapted to contain a liquid, saidshaft having apertures through same leading into the interior of thecylinder, a steam-conduit within the cylinder and having supply andexhaust connections through the apertures in said shaft, a liquid-supplyconduit and a liquid-discharge conduit communicating with the interiorof the cylinder through apertures in said shaft, means connected withsaid liquid-discharge conduit for spreading the liquid upon the outersurface of the cylinder, and a scraper acting upon said outer surface ofthe cylinder.

12. In an evaporator and drier, the combination of a cylinder revolubleon a horizontally-disposed shaft and adapted to contain a liquid, saidshaft having apertures through same leading into the interior of thecylinder, a steam-conduit Within the cylinder and having supply andexhaust connections through the apertures in said shaft, a liquid-supplyconduit and a liquid-discharge conduit coinmunicating with the interiorof the cylinder through apertures in said shaft, means connected withsaid liquid-discharge conduit for spreading the liquid upon the outersurface of the cylinder,and a vacuum-pump connected with the upper partof the receptacle through one of the apertures, in said shaft, forexhausting the air or vapor from said receptacle.

13. In an evaporator and drier, the combination of a cylinder revolubleon a horizontally-disposed axis and adapted to contain a liquid, aheater in said cylinder, a tank under said cylinder arranged to containa liquid in contact with the lower part of the periphery of thecylinder, means for drawing the liquid from said cylinder anddischarging same into said tank, means for regulating the thickness ofthe film of liquid deposited upon said cylinder, and a scraper acting onthe periphery of said cylinder for removing said film.

, 14:. In an evaporator and drier, the combination of a cylinderrevoluble on a horizontally-disposed axis and adapted to contain aliquid, a heater in said cylinder, a tank under said cylinder arrangedto contain a liquid in contact with the lower part of the periphery ofthe cylinder, means for drawing the liquid from said cylinder anddischarging same into said tank, means for heating the liquid in saidtank, means forregulating the thickness of the film of liquid depositedupon said cylinder, and a scraper acting on the periphery of saidcylinder for removing said film.

15. In an evaporator and drier the combination of a cylinder revolubleon a horizontally-disposed axis and adapted to contain a liquid, aheater in said cylinder, a tank under said cylinder arranged to containa liquid in contact with the lower part of the periphery of thecylinder, means for drawing the liquid from said cylinder anddischarging same into said tank, an adjustable blade for regulating thethickness of the film of liquid deposited upon said cylinder, and ascraper acting on the periphery of said cyllnderfor removing 16. In anevaporator and drier, the combination of a cylinder revoluble on ahorizontally-disposed shaft and adapted to contain a liquid, said shafthaving apertures through same leading into the interior of the cylinder,a steam conduit within the cylinder and having supply and exhaustconnections through the apertures in said shaft, a tank arranged tocontain a liquid in contact with the lower part of the periphery of saidcylinder, said tank having a' steam-space in its walls connected withthe exhaust from the conduit in said cylinder, a liquid supply anddischarge communicating with the interior of the cylinder throughapertures in said shaft, said discharge leading into said tank, meansfor regulating the thickness of the deposit of said liquid on saidcylinder, and means for removing said deposit.

Signed at Chicago this 11th day of J une,

FREDERICK COWIN.

Witnesses: BENJAMIN R. IRVING,

THOMAS J. FENTON.

